[rails-oceania] Making Comments Nested, Polymorphic and Self Join(able)

[Ben Sand]

Hi,

Working on a polymorphic comments model and having trouble organising the routing and controllers.

In an ideal world:
Feeds have many articles
Comments are on Feeds, Articles and on Comments themselves.
There will be a restriction on depth of comments on comments, eg. max 3 levels.
---
where we are at now:

class Feed < ActiveRecord::Base
    has_many :articles
    has_many :comments, :as => :commentable
...
class Article < ActiveRecord::Base
    belongs_to :feed
    has_many :comments, :as => :commentable
...
class Comment < ActiveRecord::Base
    belongs_to :commentable, :polymorphic => true
    # i'd like to add comments on comments through a self join here at some point too.

The problem is, comments can apply to both nested levels of the heirarchy, ie.
/feeds/1/articles/5/comments
/feeds/1/comments

---
Solutions attempted:

First tried here: http://railscasts.com/episodes/154-polymorphic-association

then went on to:
http://danielbradberry.com/?p=355#content
and got stuck when we couldn't work out how the functions should be called

then tried this: http://blog.opensteam.net/past/2008/11/26/polymorphic_controller_nested_routes_polymorphic/
but I got stuck trying to apply their method to nested routes.
---

The polymorphic controllers and route handling seems really ugly - is there any definitive solution to this, that also handles self joins and nesting nicely?

How does shallow routing stack up against polymorphic resources?

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